"OL" Force Field Refinements
for RNA and DNA Simulations

Previous versions:

ff99bsc0εζ_OL1χ_OL4 parameters for DNA are available in the Amber simulation package since Amber 14 (only in version downloaded after April 2015) and also may be downloaded here.

ff99bsc0χ_OL3 combination for RNA is present in the ff10, ff12SB and ff14SB force fields and is assigned by default by AmberTools 1.5 and later with its LEaP based tools. Port for GROMACS by Giovanni Bussi is available here.